EP0447129A2 - Verfahren und Vorrichtung zum Wickeln von Schraubnahtrohren - Google Patents
Verfahren und Vorrichtung zum Wickeln von Schraubnahtrohren Download PDFInfo
- Publication number
- EP0447129A2 EP0447129A2 EP91301918A EP91301918A EP0447129A2 EP 0447129 A2 EP0447129 A2 EP 0447129A2 EP 91301918 A EP91301918 A EP 91301918A EP 91301918 A EP91301918 A EP 91301918A EP 0447129 A2 EP0447129 A2 EP 0447129A2
- Authority
- EP
- European Patent Office
- Prior art keywords
- glue
- plies
- ply
- sensing
- stopping
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Withdrawn
Links
- 238000004804 winding Methods 0.000 title claims abstract description 42
- 238000000034 method Methods 0.000 title claims description 12
- 239000003292 glue Substances 0.000 claims abstract description 113
- 238000004519 manufacturing process Methods 0.000 claims description 3
- 230000004044 response Effects 0.000 claims description 3
- 230000011664 signaling Effects 0.000 claims description 2
- 238000001514 detection method Methods 0.000 abstract description 9
- 230000007246 mechanism Effects 0.000 abstract description 2
- 230000003213 activating effect Effects 0.000 description 3
- 230000004913 activation Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 2
- 239000000945 filler Substances 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000008901 benefit Effects 0.000 description 1
- 238000004140 cleaning Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000000994 depressogenic effect Effects 0.000 description 1
- 239000011888 foil Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
Images
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B31—MAKING ARTICLES OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER; WORKING PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31C—MAKING WOUND ARTICLES, e.g. WOUND TUBES, OF PAPER, CARDBOARD OR MATERIAL WORKED IN A MANNER ANALOGOUS TO PAPER
- B31C3/00—Making tubes or pipes by feeding obliquely to the winding mandrel centre line
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C65/00—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor
- B29C65/48—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding
- B29C65/52—Joining or sealing of preformed parts, e.g. welding of plastics materials; Apparatus therefor using adhesives, i.e. using supplementary joining material; solvent bonding characterised by the way of applying the adhesive
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/80—General aspects of machine operations or constructions and parts thereof
- B29C66/87—Auxiliary operations or devices
- B29C66/874—Safety measures or devices
- B29C66/8746—Detecting the absence of the articles to be joined
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C66/00—General aspects of processes or apparatus for joining preformed parts
- B29C66/40—General aspects of joining substantially flat articles, e.g. plates, sheets or web-like materials; Making flat seams in tubular or hollow articles; Joining single elements to substantially flat surfaces
- B29C66/41—Joining substantially flat articles ; Making flat seams in tubular or hollow articles
- B29C66/43—Joining a relatively small portion of the surface of said articles
- B29C66/432—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms
- B29C66/4322—Joining a relatively small portion of the surface of said articles for making tubular articles or closed loops, e.g. by joining several sheets ; for making hollow articles or hollow preforms by joining a single sheet to itself
Definitions
- This invention relates to spiral tube winding methods and apparatus, in which tubes are formed by spiral winding one or more strips of material.
- Spiral tube winders which wind one or more longitudinal strips or plies of paper, plastic, foil, etc., on a mandrel to form a continuously advancing tube are well known as shown, for example, by Meyer U.S. patent 4,473,368.
- Such machines typically include a glue roller or other means for applying glue to at least one of the plies going to the mandrel. If any ply to which glue is being applied breaks between the glue application point and the mandrel, that ply may become fouled in the glue applying apparatus. This can damage the glue application apparatus and/or can make resuming normal operation a considerable chore (e.g. by necessitating partial disassembly and/or extensive cleaning of the glue application apparatus).
- the invention also aims to provide spiral tube winders and winding methods which stop automatically whenever one of the plies being glued breaks.
- apparatus including means for supplying a plurality of longitudinal plies, a mandrel, means for pulling the plies longitudinally towards the mandrel and winding the plies around the mandrel in a spiral to form a spiral-wound tube, and glue application means disposed intermediate the supplying means and the pulling and winding means for applying glue to at least some of the plies, characterised by sensing means disposed between the glue application means and the pulling and winding means for sensing whether each ply to which glue is applied is present at the sensing means, first stopping means responsive to the sensing means for stopping the pulling and winding means if the sensing means indicates that any ply to which glue is applied is not present at the sensing means, and removal means responsive to the sensing means for removing all of the plies to which glue is applied by said glue application means if the sensing means indicates that any of the plies to which glue is applied is not present at the sensing means.
- the invention also provides apparatus including means for supplying a plurality of longitudinal plies, a mandrel, means for pulling the plies longitudinally towards the mandrel and winding the plies around the mandrel in a spiral to form a spiral-wound tube, and glue application means disposed intermediate the supplying means the pulling and winding means for applying glue to at least some of the plies, characterised by sensing means disposed between the glue application means and the pulling and winding means for sensing and indicating whether each ply to which glue is applied is present at the sensing means, identification means responsive to sensing means for identifying which of the plurality of plies the sensing means has indicated have been present for at least a predetermined time interval, signalling means responsive to the sensing and identification means for producing an output signal when the sensing means indicates that any ply previously identified by identification means is no longer present, first stopping means responsive to the output signal for stopping the pulling and winding means, and removal means responsive to the output signal for removing all plies to which glue is applied from the glue application
- the invention also provides a method including the steps of supplying a plurality of longitudinal plies, applying glue to at least some of the plies with glue application means, pulling the plies longitudinally towards a mandrel and winding the plies in a spiral around the mandrel using pulling and winding means to form a spiral-wound tube, characterised by sensing at a point between the application means and the pulling and winding means whether each ply to which glue is applied is present, stopping the pulling and winding means if any ply to which glue is applied is not present at the sensing point, and removing all plies to which glue is applied from the glue application means if any ply to which glue is applied is not present at the sensing point.
- the invention provides a method including the steps of supplying a plurality of longitudinal plies, applying glue to at least some of the plies by glue application means, and pulling the plies longitudinally towards a mandrel and winding the plies in a spiral around the mandrel using pulling and winding means to form a spiral-wound tube, characterised by sensing at a point between the glue application means and the pulling and winding means whether each ply to which glue is applied is present to produce an output indication for each ply while that ply is present, timing the duration of the output indication for each ply to identify those plies which have been indicated to be present for at least a predetermined time interval, producing an output signal when the output indication ceases for any ply previously identified as present for the time interval, stopping the pulling and winding means and removing all of the plies to which glue is applied from the glue application means on production of the output signal.
- Spiral tube winders are sometimes constructed to wind various numbers of plies. If ply break sensing is provided, it must be possible to activate it for only those ply lanes which are currently in use. If such activation must be performed by the human operator of the apparatus, the operator may sometimes forget that a ply has been added and fail to activate the ply break detector for the lane handling that ply. If that ply breaks, the machine will not stop as the operator expects, and all of the foregoing problems may result even though the machine is equipped with a ply break sensor system.
- One aspect of the invention overcomes this problem by providing a ply break sensor system which automatically detects which ply lanes are in use so that a break in the ply in any of those lanes can be detected in order to stop the machine.
- a sensor for detecting the presence or absence of a ply in each ply lane in which the ply (if present) passes through glue application apparatus. If a ply is present in a given lane when the machine starts (or for a predetermined time interval while the machine is in operation), ply break detector logic associated with that lane is activated. The ply break detector logic for all other lanes remains inactivated. If the sensor and ply break detector logic for any activated lane subsequently detects that the associated ply is absent, the ply break detector logic produces an output signal which is used to stop the machine. For example, this output signal may be used to stop the winder belt motor and the glue application apparatus, and also to remove all plies from the glue application apparatus.
- FIG. 1 is a plan view of an illustrative embodiment of tube winding apparatus constructed in accordance with the principles of this invention.
- FIG. 2 is a simplified elevational view (partly in block diagram form) of a portion of the apparatus of FIG. 1.
- FIG. 3 is a block diagram of illustrative apparatus for controlling the tube winder of FIG. 1 in accordance with this invention.
- FIG. 4 is a flow chart of illustrative logical operations performed by certain elements in FIG. 3 in accordance with this invention.
- FIG. 5 is a block diagram of an alternative embodiment of apparatus for controlling the tube winder of FIG. 1 in accordance with this invention.
- FIG. 6 is a flow chart of illustrative logical operations performed by certain elements in FIG. 5 in accordance with this invention.
- the illustrative tube winding apparatus 10 shown in FIG. 1 is capable of winding tubes made up of as many as five strips or plies 12 (only a representative one of which is shown (in part) in FIG. 1). Plies 12 are fed in side-by-side (moving to the left as viewed in FIG. 1) from supply rolls 14 which are removably mounted on bobbin stand 16.
- Splice detect assembly 20 includes a splice detector associated with each ply for detecting splices in the associated ply. As discussed in application Serial No. 493718 , this splice detection information is used to reject finished lengths of tube which contain splices.
- plies 12 move (to the left as viewed in FIG. 1) through apparatus 30 (described in more detail in commonly assigned U.S. patent application Serial No. 493755 , filed 15 March 1990 , which is also hereby incorporated by reference herein) which performs such tasks as appropriately tensioning each ply and applying glue from glue roller 32 to at least some of the plies.
- glue is not applied to the ply which is nearest the top of FIG. 1 and which becomes the innermost ply in the finished tube.
- each of the other ply lanes has a ply detector or sensor 34 for sensing the presence or absence of an associated ply in that lane between glue roller 32 and mandrel 50.
- a possible construction of each of sensors 34 is shown in more detail in FIG. 2 and described in more detail below.
- the topmost lane in which the ply 12 does not receive glue
- This topmost ply passes in contact with meter wheel 40 so that the topmost ply causes the meter wheel to rotate at the same peripheral speed that the ply is travelling.
- An encoder associated with meter wheel 40 produces an output signal proportional to the speed of the meter wheel.
- this signal is used to control various other functions of the machine such as the speed of glue roller 32 and the speed of the cutter 70 which periodically cuts off finished lengths of tube as described below. If the topmost ply breaks, meter wheel 40 will stop, and this can be used to stop the machine in a manner similar to the way in which the machine is stopped in accordance with the present invention if any one of sensors 34 detects that the associated ply has broken.
- Cutter 70 periodically cuts transversely through the continuously advancing tube to produce finished lengths of tube of predetermined length. These finished lengths of tube continue to advance lengthwise one after another into accept/reject mechanism 80. If a tube length has been selected for rejection (e.g., because it contains a splice from one or more of input strips 12), it is deflected to the side (e.g., by momentary interruption of an air flow required for continued travel of the tube along an axis extending from mandrel 50) and exits from the apparatus via reject chute 82. If not rejected as described above, the tube continues past reject chute 82 to accept chute 84 where it begins to be conveyed to the side toward tray filler 90. Tray filler 90 fills successive trays with finished tubes and discharges the filled trays to allow the finished tubes to be conveyed to other apparatus (not shown) for use of the tubes.
- tray filler 90 fills successive trays with finished tubes and discharges the filled trays to allow the finished tubes to be conveyed to other apparatus (not
- a typical ply sensor 34 may include a light source 34a for directing light to one of the plane surfaces of the associated ply 12. If that ply is present, the surface of the ply reflects the light from light source 34a to photocell 34b which produces an output signal proportional to the amount of light it receives. Accordingly, the level of the output signal of photocell 34b indicates whether or not ply 12 is present.
- each ply sensor 34 is applied to a respective one of signal processors 102.
- Each signal processor 102 also receives the output signal of winder belt start control 110 and the output signal of glue roller start control 120.
- Each of controls 110 and 120 may be a push-button type switch for producing a momentary output signal when depressed by the human operator of the system. Operation of winder belt start control 110 causes winder belt motor controller 112 to start and continue to operate winder belt motor 114 which drives belt 60. Operation of glue roller start control 120 similarly causes glue roller motor controller 122 to start and continue to operate glue roller motor 124 which drives glue roller 32.
- Operation of glue roller start control 120 also causes ply position controller 132 to operate ply positioners 134 so that the plies 12 in the lanes having sensors 34 are brought into contact with the surface of glue roller 32.
- Ply positioners 134 are elements which place plies 12 in contact with the cylindrical surface of glue roller 32 when the machine is operating and the glue roller is rotating, and which lift plies 12 off the glue roller when the machine stops in order to prevent the plies from sticking to the glue roller while the glue roller is stopped.
- Illustrative ply positioners 134 are shown in more detail in above-mentioned application Serial No. 493755 .
- Each of signal processors 102 performs the logical steps shown in FIG. 4. This logic basically waits at step 202 until winder belt start control 110 is operated. When that occurs, winder belt 60 starts (as indicated by block 204) and control passes to step 206. The logic again waits at step 206 until glue roller start control 120 is operated. When that occurs, glue roller 32 starts (as indicated by block 208), the plies 12 are moved into contact with the glue roller by ply positioners 134 (as indicated by block 210), and control passes to step 220.
- step 220 the output signal of the associated ply sensor 34 is compared to a predetermined threshold value in order to determine whether the photocell 34b in that sensor is receiving at least the amount of light required to indicate that a ply 12 is present opposite that sensor. If that amount of light is being received, a ply is in place in the associated lane and control passes to step 230. Otherwise, control passes to step 222.
- Step 222 is provided so that if a ply is not in place in a given lane when the machine is first started, a ply can be subsequently added in that lane and the ply break sensing protection for that lane will thereafter be automatically activated.
- Step 222 is basically similar to step 220 in that it involves comparing the output signal of the associated sensor 34 to a predetermined threshold value in order to determine whether or not the photocell 34b in that sensor is receiving at least the amount of light that it would receive if a ply were present.
- step 222 prevents activation of the ply break detection portion of the logic until the ply has been continuously detected as present for at least a predetermined time interval (referred to as "x seconds" in step 222). Until that has occurred, the logic remains at step 222. But as soon as a ply has been continuously detected for x seconds, step 222 passes control to step 230, thereby activating the ply break detection logic for the associated lane.
- Step 230 is again similar to step 220 in that the output signal of the associated ply sensor 34 is repeatedly compared to a predetermined threshold value to make sure that the photocell 34b in that sensor continues to receive at least the amount of light which indicates that the ply is present in front of the sensor. As long as that is the case, the logic remains at step 230. However, as soon as the sensor 34 output signal indicates that the ply is no longer present, control passes from step 230 to step 240 which causes the affected signal processor 102 to apply to OR gate 104 (FIG. 3) a signal indicating that a ply has broken between glue roller 32 and mandrel 50.
- OR gate 104 FIG. 3
- OR gate 104 When OR gate 104 receives a signal of the type described above from any of signal processors 102, OR gate 104 produces an output signal which is applied to output indicator 106, winder belt motor controller 112, glue roller motor controller 122, and ply position controller 132. In response to this signal, output indicator 106 produces an output (e.g., an audible and/or visible output) to alert the operator of the machine to a malfunction, and ply position controller 132 causes ply positioners 134 to remove plies 12 from contact with glue roller 32. Also in response to this signal, glue roller motor controller 122 stops glue roller motor 124, and winder belt motor controller 112 stops winder belt motor 114. Accordingly, the effect of a ply break indicating output signal from the signal processor 102 for any active lane is to shut down the machine and alert the machine operator that a malfunction has occurred.
- output indicator 106 produces an output (e.g., an audible and/or visible output) to alert the operator of the machine to a malfunction
- step 240 control returns to step 202 in which the logic waits for the machine to be restarted by the operator.
- FIGS. 5 and 6 show an alternative embodiment of the invention with somewhat different operating characteristics.
- FIG. 5 is similar to FIG. 3 except that in FIG. 5 ply position controller 132 has its own ply position start control 130. Accordingly, in FIG. 5 each of winder belt motor 114, glue roller motor 124, and ply positioners 134 can be started independently (although it may be desirable to have certain interlocks among elements 110, 120, and 130 (e.g., so that winder belt motor 114 cannot be started unless glue roller motor 124 is already operating)).
- FIG. 6 shows alternative ply break detection logic executed by each of signal processors 102 in FIG. 5 as will now be described.
- step 310 causes control to pass to step 340 (with winder belt 60 being started as indicated by block 204). Once control passes to step 340 in this manner, tests 320 and 330 are no longer performed.
- step 320 causes control to pass to step 340 (with glue roller 32 being started as indicated by block 208). Again, once control passes to step 340 in this manner, tests 310 and 330 are no longer performed.
- step 330 causes control to pass to step 360, after which tests 310 and 320 are no longer performed. (Step 330 is similar to step 222 in FIG. 4.)
- Step 340 (which is similar to step 220 in FIG. 4) tests whether a ply is present in the associated lane. If so, then control passes to step 360 in which the ply break detection for the associated lane is activated because the lane has been found to be in use. (Step 360 can, of course, also be reached directly from step 330 as described above.) If a ply is not found to be in place when step 340 is performed, then control passes to step 350, which (like step 222 in FIG. 4) prevents activation of the ply break detection for the associated lane until after a ply has been detected in that lane for x seconds or more. Only when that has occurred does step 350 pass control to step 360, thereby activating the ply break detection for the associated lane.
- Step 360 is similar to step 230 in FIG. 4 and is performed repeatedly until the ply in the associated lane is no longer found to be present. This indicates a break in the associated ply, and step 360 therefore then passes control to step 370.
- Step 370 is exactly the same as step 240 in FIG. 4 and has the same effect on the apparatus of FIG. 5 that performance of step 240 in FIG. 4 has on the apparatus of FIG. 3. After performing step 370, control returns to steps 310, 320, and 330 to await restarting of the winder.
- the embodiment shown in FIGS. 5 and 6 has the possible advantage of activating the ply break detection system earlier in the winder starting sequence.
- signal processors 102 in FIGS. 3 and 5 can he implemented in any of a variety of ways.
- programmable logic devices can be used, or all of elements 102 can be combined in a single, suitably programmed, general purpose microprocessor.
- step 220 in FIG. 4 is optional and can be eliminated if desired, with control always passing from step 206 to step 222.
- various other types of ply sensors 34 e.g., microswitches
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Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US493720 | 1990-03-15 | ||
US07/493,720 US5059164A (en) | 1990-03-15 | 1990-03-15 | Spiral tube winding methods and apparatus including ply break sensing |
Publications (2)
Publication Number | Publication Date |
---|---|
EP0447129A2 true EP0447129A2 (de) | 1991-09-18 |
EP0447129A3 EP0447129A3 (en) | 1992-05-06 |
Family
ID=23961429
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP19910301918 Withdrawn EP0447129A3 (en) | 1990-03-15 | 1991-03-07 | Spiral tube winding methods and apparatus |
Country Status (3)
Country | Link |
---|---|
US (1) | US5059164A (de) |
EP (1) | EP0447129A3 (de) |
JP (1) | JPH05469A (de) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004014641A1 (en) * | 2002-08-09 | 2004-02-19 | Fabio Perini | Machine and method for producing cardboard tubes |
Families Citing this family (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH1134187A (ja) * | 1997-07-15 | 1999-02-09 | Mitsubishi Heavy Ind Ltd | 製函用シート材の接合部判定方法及び製函用シート材の接合部判定装置 |
NL2021981B1 (en) * | 2018-11-12 | 2020-05-15 | Imatec Innovative Machine Tech S A R L | System for producing lengths of tube comprising helically wound strips |
Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3928844A (en) * | 1974-06-17 | 1975-12-23 | Butler Automatic Inc | Web break detector system |
GB2171287A (en) * | 1985-02-26 | 1986-08-28 | Gd Spa | Method and device for feeding strip paper in a dual-rod cigarette manufacturing machine |
DE3822496A1 (de) * | 1988-07-02 | 1990-01-04 | Kotterer Grafotec | Vorrichtung zum fangen einer gerissenen bedruckstoffbahn |
Family Cites Families (6)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3165985A (en) * | 1958-12-17 | 1965-01-19 | American Can Co | Method of forming pull string containers |
US3087393A (en) * | 1960-04-04 | 1963-04-30 | American Can Co | Machine and method for manufacturing fibrous container bodies |
US3044423A (en) * | 1960-04-14 | 1962-07-17 | American Can Co | Machine for manufacturing fibrous container bodies |
US3165034A (en) * | 1962-10-08 | 1965-01-12 | Reynolds Metals Co | Method and apparatus for cutting tubular members from axially advancing tubular stock |
US4242167A (en) * | 1978-10-26 | 1980-12-30 | B & H Manufacturing Company, Inc. | Labeling machine |
US4416651A (en) * | 1981-07-30 | 1983-11-22 | Champion International Corporation | Envelope gummer cylinder clutch and brake |
-
1990
- 1990-03-15 US US07/493,720 patent/US5059164A/en not_active Expired - Lifetime
-
1991
- 1991-03-07 EP EP19910301918 patent/EP0447129A3/en not_active Withdrawn
- 1991-03-15 JP JP3128875A patent/JPH05469A/ja active Pending
Patent Citations (3)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US3928844A (en) * | 1974-06-17 | 1975-12-23 | Butler Automatic Inc | Web break detector system |
GB2171287A (en) * | 1985-02-26 | 1986-08-28 | Gd Spa | Method and device for feeding strip paper in a dual-rod cigarette manufacturing machine |
DE3822496A1 (de) * | 1988-07-02 | 1990-01-04 | Kotterer Grafotec | Vorrichtung zum fangen einer gerissenen bedruckstoffbahn |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2004014641A1 (en) * | 2002-08-09 | 2004-02-19 | Fabio Perini | Machine and method for producing cardboard tubes |
Also Published As
Publication number | Publication date |
---|---|
JPH05469A (ja) | 1993-01-08 |
EP0447129A3 (en) | 1992-05-06 |
US5059164A (en) | 1991-10-22 |
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